Discussion
The compressor stroke length in mm is
Answer: B
The stroke is about 33.7 mm.
The suction volume flow is \(0.813 \times 0.15 = 0.122\) m3/min. At 1440 rpm, with two single acting cylinders each making one suction stroke per revolution:
\[ \begin{aligned} V_{cyl} &= \frac{0.122}{1440 \times 2} = 4.23 \times 10^{-5}\ \text{m}^{3} \\ A &= \tfrac{\pi}{4}(0.04)^{2} = 1.257 \times 10^{-3}\ \text{m}^{2} \\ L &= V_{cyl}/A = 0.0337\ \text{m} \end{aligned} \]
That is 33.7 mm, taking the volumetric efficiency as 100%. Putting the whole flow through one cylinder doubles the stroke to 67.4 mm, and halving it to 16.8 mm would treat the cylinders as double acting.
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